Davit.



J. CAMERON.

DAVIT.

APPLICATION FILED JUNE 1.1915.

Patented Nov. 30, 1915.

2 SHEETS-SHEET 2.

JOHN CAMERON, OF NEWARK, NEW JERSEY.

Specification of Letters Patent.

Patented Nov. 30, 1915.

Application filed June 7, 1915. Serial No. 32,530.

To all whom it may concern:

Be it known that I, JoHuCAM'ERoN, a

. following is a specification.

-.small craft are used or stowed. The invention provides a davit for this purpose,.

This invention relates to an improved clavit for suspendlng and also for launchlng life boats or similar small craft from ves-' sels, wharves and like places on which such which clavit is steady when it is in the pos1- tion it occupies when suspending a boat in-- Y board, being provided with means for holdwhen the arms are in their outboard posiing'the arms of the davit againstswinging. The davit is one which has a tripping 'means for releasing the holding means of the arms so that the arms can be swung inv the usual manner to .place the life boat or other small craft outboard, the hold ng means becoming automatically operative tion, so that the arms, and consequently the boat, are held steady against swinging due to any pitching of the vessel on-which the davit is mounted. The holding means is preferably so mounted that any pitching, of

the vessel and consequent fore and aft' swinging of the life boat serves to assure the able bearings 12 secured to the side or top loc ing of said holding means;

.'I he davit is designed to provide a means for launching life boats'and the like, which davit requires a less number of men to operate it to swing the life boat outward than the old form of clavit,the number of inen employed at the task of preventing undue swinging due to pitching being necessarily few, since the swinging of the arms in the operation of swinging the boat outboard is limited, and successive fore and aft move ments of the arms operate to automatically lock the arms against further swinging after the arms are both in their outboard- The same is true when the arms positions. are swung to the1r inboard positions.

The davitand its lockmgmechanism 1s I simple, which insures its operation when needed, and the mechanism is located and disposed so that it is not in the way of passengers or crew when they are to use the The looking or holding mechanism the locking mechanism canbe conveniently I placed for easy operation,the person aftertripping the holding mechanism being available for other duties and labor in swinging the arms of the clavit and the boat.

It will be understood that minor changes can be made and the relation and disposition of the parts altered from that shown in the drawings without departing from the scope of my invention. The illustrations show one embodiment of my invention for the purpose of clearly setting forth the operation thereof, and is not the only form in which the invention can be produced.

In the drawings, Figure 1 is a face view of my improved davit with the arms broken away near the lower part thereof. Fig. 2

"nism showing the successive positions of them when a boat isswung from its inboard position to its outboardposition;

In the form shown in the drawings, the davit comprises two arms 10 and 11 which are of anv suitable shape, preferably curved at the upper portion to give-a proper overhang. The davit arms are mounted in suitof the deck 13, the arms being usually extended below the bearings 12 to lower bearings 141 on the next lower'deck or at an intermediate point The arms are held better against tiltingwhen mounted in vertically separated bearings. The arms are provided on their top ends with means for suspending a life boat or similar small craft.

One form of suspension means is shown in the drawing, this consisting of frames 15 which are pivoted at 16to the eyes 17 of the connected so 7 that they canbe used more in unison than if they-were independent and with less strain on the boat and thetackle.

The drawings show this connection in the form of a bar 20 swiveled or pivoted at each' end as at 21 to the tops of the frames 15.

Thearms 10 and 11 of the davitare'provided with holding or locking means that normally hold the davits in outboard or in inafter.

board positions. but which are adapted to be tripped or released, and when so released permit the swinging of the arms to a position re erse to the position they were in when tripped. The swinging of the arms causes the h lding mechanism to become operative when the arms arrive in the posit on to which they are expected tobe swung.

In the form shown in the drawings the arms are provided with duplicate mechanisms. On'the deck 13 are arranged the base plates 22 of any suitable shape, being usually in the form of divided or V-shaped arms as will be seen from Fig. 3, the arms being adapted'to be secured by bolting or other means to the deck 13 or other suitable support. Each base plate has a block 23 and a raised part 24,,the ends 25 and 26 of which form stops for purposes to be hereinafter described. The davit arms 10 and 11 pass centrally through the blocks 23 and are r0- tatable therein. The arms 10 and 11 have secured thereto collars 27 usually made in halves and bolted around the arms, the col On each block 23 are racks 33 and 34- which are preferably placed out of the path of travel of thepawls32 but are in the path of the segmental gears 30 and 31. In the form shown, each rack 33 is on the inside and is adapted to engage a segmental gear 30, and each rack 34 is on the'outer edge of the block 23 and adapted to engage the segmental gear 31. The racks are placed so that they will operate their respective gears toturn over the pawls attached to the gears to-cause the pawls to be placed in proper operative positions, as will bedescribed here- T he gears have their teeth extended around their peripheries far "enough to permit their engagement with their respec tive racks when the pawls are swung to one side'of their centers, but to cause them 'to engage their respective "racks when the .zpa'wls are swung-to the otherside'of thecenters.

The disposition of the parts can be changed in Various ways and still bring about the desired results, but in the drawing the raised part-or abutment -24 on'each docked. against any swinging movement.

bl0ck- 23 is on the outer side of its block, that is, 'on the side farthest away from the -oth-er,-and,as clearly shown in Fig. 1, the

paw-ls are in engagement with the edges '26 of therabutments and the 'davit arms :are It will, of course, be understood Ethat anfy suitable lashing pr tyingcan be, idone {to secure the boat 18 frrm swinging in relation to the davit arms when the boat is stowed. and such means are not shown on the drawing.

Suitable means for tripping the holding means, such as the pawls 32, are provided,

trated, of short levers or noses 35 arranged on both sides of each blrck 23, the noses or levers being mounted to swing with a shaft 36 mounted in the'bearing 37. The noses are placedso that they will be underneath the lugs 38 of the pawls 32. The rocking of the shafts 36 and the r noses 35 is 'limited by suitable means, such as the stops 39,

which engage the bearings 37 so that the noses can not be swung too far upward. Suitable handles or levers i0 are provided for the rocking of the'shafts 36 and are conveniently placed sothat the pawl of the locking mechanism, which is adapted to be operated, can be tripped without inconvenience.

The operation of the device is as follows: Assumingthat the boat 18 has been swung inboard, as shown in Fig. 5, the zpawls 32 will both be on the near side and engaging the edges 26 0f the abutments 24, and the clavits can not swing, and the whole structure is in locked or rigid position. When it is desired to swing the boat outboard, either one of the pawls can be operated to initiate the movement, but in'the directions shown in Figs. 5 to 8, inclusive, it will be seen that the one to the left is operated' first. This operation takes place by a person'swinging the handle 40 onthisparticu- ,lar side of the 'davlt and raislng the pawl 32 through the intermediate mechanism which raises the pawl above the top of the stop 26, and this pawl is swung forward, as will be clearly seen from Fig. 6, causing the other pawl on the right hand side of Fig.

.5 to retreat from its stop, the two davit arms working in unison by reason of their being connected by the bar 20, but this connection, it will be understood, is. not unduly strained, if the distance between the ends of the tops of the davit arms becomes slightly greater or less than normal due to the unequal swinging of them, by reason of the frames 15 to which the bar 20 is fastened being pivoted to the tops of the arms as at 16. Vhen the pawl 32 on the right in Fig.

6 retreats itdoes not turn over because in this position. the segmental gear 31 has its bottommosttooth, as at'a'in Fig. at, above the line ofteeth in the rack 34:. It will be understood that in the movement so far as illustrated in Fig. 6, the pawl 32 slides without obstruction along the block 23 The davit arm ll is now swung as indicated in dotted lines at b, and when this swinging takes place, the davit arm 10 is necessarily swung to a position farther around toward the outside, as shown =1n clot-ted out .these consisting. in the embodiment illusthe rack 33, and since the teeth on the gear 30 are out of line circumferentially with the teeth of the gear 31, the segmental gearSO engages the rack 33, and the gear and the pawl being cleared, the pawl is caused, by

gravity, to fall in a position reverse to the one in which it was started, but it falls with its end beyond the stop or edge 25 of the abutment 24 and isthus not halted in its swinging movement. The davit arm 10 is now swung outboard, as indicated by the dotted line 0 in Fig. 7, which causes the davit arm 11 to be swung to the dotted position shown in Fig. 7 but as the davit arm 10 is swung outboard, the davit arm 11 is also brought around again to an outboard position, and the davit arm 10 in being swung out oard-2'. e. from the position shown in Fig. 6 to that shown in Fig. 7 has its pawl 32 turned over as in the case of the davit arm 11 when it was swung outboard. The movement of the davit arm 10 to its outboard position has necessitated the retreating or pulling back of the pawl of the davit arm 11 until it is in rear of its stop 25, and a swinging movement slightly to the ri ht will b ing it to the position shown in Fig. 8, which. at the same time. permits the bringing of the pawl 32 of the davit arm 10 into position, and the two davit arms are locked in their outboard positions.

It will be evident that when both arms have been swung to a position outward beyond the plane of the pivots of the davit arms that any alternate movement back and forth of the davit arms, due to pitching of the vessel, will assist in operating the locking device so that they automatically will turn over the pawls on the two da it arms,

and on a second mo ement in this direction or tackle to seriously interfere with the' launching of the boat. By my improved invention the pitching can in fact be utilized in assisting the locking of the davit arms againstswinging or rotation, since swinging in one direction and another swinging in the opposite direction are all that is necessary to turn over both pawls, and as each.

and the absence of the necessity of holding the davit arms against swinging when they the old style of davit, in other directions claim:

one retreats behind its respective stop 25 it will thus be held against successive movement in that direction.

It will be understood that other means for turning the pawls over beside racks and segmental gears can be employed, and the particular form and relation of the parts can be altered without departingfrom the invention. It will be evident also that in this device there is very little mechanism, and what there is is raised to a slight distance above the deck. It does not, therefore, interfere seriously with the loading of passengers or crew into the boat. After it has been swung outboard, and the lack of 0bstruction is calculated to go a great way toward speedy loading of boats and thus provide greater safety in emergencies, it requires but little labor to operate the davit,

are in their outboard positions permits the use of members of the crew, who would be engaged in steadying the davit arms with where they probably would be essential in an emergency.

The parts of this invention are simple in their construction and their functions are simple, thus insuring their operation when required, and particularly in eme gencies where there is very apt to be confusion and a lack of order.

Having now described my invention, I

1. A davit comprising rotatablv arranged davit arms, and automatic means for locking sa d arms when both arms are in predetermined positions.

2. A davit comprising rotatably' arranged davit arms, automatically operated means on said arms for locking them when both arms are in predetermined positions, and means for tripping sa d lock ng means.

3. A davit comprising vertically arranged rotatable davit arms, supporting means for said arms, locking means on the arms for engaging the supporting means to lock the arms in predetermined positions. and means on said support to engage the locking means to automatically cause the locking means to assume a locking position.

4. A davit comprising vertically arranged rotatable davit arms, supporting means for said arms, locking means on the arms for engaging the supporting means to lock the arms in predetermined positions, means on said support to engage the locking means to automatically cause the locking means to assume a locking position, and a tripping means for releasing the locking means.

5. A davit comprising rotatably arranged davit arms, locking means disposed so that the arms are locked only when they are both in their inboard and outboard positions, and. 1.30

means for causing the automatic operation of said locking means bythe rotation of the davit arms.

6. A davit comprisingv rotatably arranged davit arms, locking means on each arm disposed Efothat the arms are locked when both have arrived at their inboard and outboard positions, means for causing the automatic operation of said locking means by the rotation of the davit arms, and means for tripping thelocking means of one arm which releases both arms for rotation.

7. A davit comprising rotatably arranged davit arms, stops adjacent to said arms,

pawls on the arms for engaging the stops only when both arms are in inboard or outboard positions, and means for raising the pawls from the stops. q

8. A davit comprising rotatably arranged davit arms, oppositely arranged stops adjacent to each arm, a pawl secured to the arm and adapted to be reversed to alter- V nately engage the stops, and means for engaging the pawl when an arm is rotated, said means acting to reverse the pawl.

9. A davit comprising rotatably arranged davit arms, oppositely arranged stops adjacent to each arm, a pawl secured to the arm and adapted to be reversed to alternately engage the stops, means for engaging the pawl when an arm is rotated, said means acting to reverse the pawl, and a manually operated device for raising a pawl when it is engaging a stop.

10. A davit comprising rotatably arranged davit arms, each davit arm having a pivoted pawl thereon, oppositely arranged stops adjaeent to each davit arm, the pawl being adapted to be reversed to engage the stops alternately, and reversing means for throwing the pawl when the davit is swung.

11. A davit comprising rota tably arranged davit arms, each davit arm having a pivoted pawl thereon, oppositely arranged stops adjacent to each davit arm, the pawl being 1,1.ea s2 adapted to be reversed to engage the stops alternately, and means for reversing the pawl when the davit is swun said means being disposed so that the pawl is dropped beyond the stop it is approachingand en-- gages the stop by a slight backward movement of the arm.

12. A. davit comprising rotatable arms connected to move substantially in unison, and locking means on each arm to automatically lock the arms in inboard and outboard positions. x

13. A. davit comprising rotatable arms connected to move substantially in unison,

to engage the stops from opposite directions,

segmental gears on the pawl, racks in the path of the gears, the gears being disposed so that they will engage their respective racks when the pawl is in predetermined positions in Order to reverse the pawl when the davit is swung.

16. A davit comprising a. rotatable davit arm, a pawl on said arm, oppositely arranged stops, a swinging pawl on the davit to engage the stops from opposite directions, reversing means in the path of the pawl to reverse the pawl when the arm is swung,

and a manually operated means adapted to engage the pawl 011 each side of the stops.

In testimony that I claim the foregoing, I

have hereunto set my hand, this 3rd day of June 1915.

- JOHN CAMERON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. i 

